I sit in the darkroom, and flip off the lights when I change cassettes in the bulk loader. After the new cassette is in, I turn on the lights and label the Just loaded Cassette, get the parts ready for the next one, then spool the film and flip out the lights to change the cassette.

I also pull a little out of the new cassette beofre I cut the film, so that I am not pulling any film thorough the light trap of the laoder while the light trap is closed.

I use an ALDEN 200, so the number of frames that would be fogged if it worked completly in the light is larger tahn with some of the smaller loader.s